function openWindow(theURL,winName,winWidth,winHeight,otherFeatures) {
   var x = 0;
   var y = 0;
   x = (screen.availWidth - 12 - winWidth) / 2;
   y = (screen.availHeight - 48 - winHeight) / 2;
   if (otherFeatures != "") {otherFeatures = "," + otherFeatures}
   var features = "screenX=" + x + ",screenY=" + y + ",width=" + winWidth + 
",height=" + winHeight+",top="+y+",left="+x+"'" + otherFeatures
   var NewWindow = window.open(theURL,winName,features);
   NewWindow.focus();
}
function newwin(url, naam, breedte, hoogte, resize, scrollbars) {
  var winopen = window.open(url, naam, "width=" + breedte + ",height=" + hoogte + ",left=10, top=10, screenx=10, directories=no, location=no, menubar=no, resizable=" + resize + ",scrollbars=" + scrollbars + ",status=no,toolbar=no");
  winopen.focus();
}
function zoeken(zoekstring) {
   url = "http://www.google.nl/search?num=25&lr=lang_nl&q=" + zoekstring.value + "+site%3Amiddendelfland.net";
   newwin(url,"ZoekWindow",800,800,"yes","yes");
}